Unit prefixes or obstacles (prefix) is the unit of words that fill the other units, such as the un forward-in the English language in the word unhappy, untidy, unimportant, unreleased, the word "the" in Thailand, such as homework, language politics. The rally. The protests, etc.
Affix or barrier (prefix) is the unit that fills the front of the unit un- like the English word unhappy, untidy, unimportant, unreleased word "the" in Thailand as political rallies of the house. protests, etc.
Prefix or obstacles (prefix) is added in front of morpheme morpheme, such as un - in English, in the unhappy untidy,, ,, unreleased unimportant. "" "in English, such as homework, political rallies, protest, etc.